The invention discloses a B-type mechanism with a lifting and swinging massage head and realizing perfect massage acting force. The mechanism is provided with a guide seat (6) with a transverse notch; a motor mounting seat (5) is arranged in the transverse notch of the guide seat; coaxial vertical holes are formed in the guide seat and the motor mounting seat; a guide tube (2) penetrates in the vertical hole; the guide tube is loosely sleeved in the vertical hole of the guide seat and tightly sleeved in the vertical hole of the motor mounting seat; a swing rod (7) is arranged in the guide tube; the middle part of the swing rod is pivoted with the tube wall of the guide tube, and the outer diameter of the swing rod is less than the inner diameter of the guide tube; a motor A (4) is fixed on the motor mounting seat, and an eccentric shaft of the motor A is connected with a connecting rod (9); the other end of the connecting rod is connected with the lower end of the swing rod; and the upper end of the swing rod is detachably connected with a massage head (1). The B-type mechanism disclosed by the invention is used for replacing manual massage.